tYSR20

Chapter 2Declaring Variables ConstantlyIn This Chapter Declaring variables Declaring different types of variables Using floating-point variables Declaring and using other variable typesThe most fundamental of all concepts in C++ is the variable — a variable islike a small box. You can store things in the box for later use, particularlynumbers. The concept of a variable is borrowed from mathematics. A statementsuch asx = 1stores the value 1 in the variable x. From that point forward, the mathematiciancan use the variable x in place of the constant 1 — until she changes thevalue of x to something else.Variables work the same way in C++. You can make the assignmentx = 1;From that point forward in the program, until the value of x is changed, anyreferences to x are the same as referencing 1. That is, the value of x is 1.Unfortunately, C++ has a few more concerns about variables than the mathematiciandoes. This chapter deals with the care and feeding of variables in C++.Declaring VariablesC++ saves numeric values in small storage boxes known as variables. Mathematiciansthrow variables around with abandon. A mathematician might (forexample) write down something like the following: